一个简单的使用sqlite3数据库的电话薄，很简单适合初学者看看，而且里面并没有很多容错处理很容易看懂的。

#include<stdio.h>
#include"sqlite3.h"
static int callback(void *notused,int l,char **v,char **lname);
int seek(sqlite3 *db);
int insert(sqlite3 *db);
int replace(sqlite3 *db); 
int del(sqlite3 *db);
int option(sqlite3 *db); 
int quit(sqlite3 *db); 
int main()
{   
    int num;
    int rc;
    struct sqlite3 *db;
    rc=sqlite3_open("sql.db",&db);
    if(rc)
    {
        printf("成功打开数据库");
    }
    else printf("数据库打开失败");
    num=option(db);
    quit(db);
}
int option(sqlite3 *db)
{
    int num;
    int rc;
    printf("\t1.查询\n\t2.添加记录\n\t3.更新记录\n\t4.删除记录\n\t5.清屏\n\t6.创建表\n\t7.退出\n");
    printf("请输入:");
    scanf("%d",&num);
    switch (num)
    {
        case 1:seek(db);
        break;
        case 2:rc=insert(db);
        break;
        case 3:replace(db);
        break;
        case 4:del(db);
        break;
        case 5:
                {
                    system("cls");
                    option(db);
                }
        case 6:
                {
                    rc=sqlite3_exec(db,"CREATE TABLE telbook(name,telnum)",0,0,NULL);
                    printf("%d\n",rc);
                }
        break;
        case 7:{
                    printf("即将关闭\n");
                    quit(db);
                }
        break;
        default:
                {   printf("请选择\n");
                    option(db);
                } 
        break;
    }
}
int seek(sqlite3 *db)
{
    int num;
    int rc;
    char *zSQL;
    char *sql_name[20],*sql_telnum[11];
    printf("\t1.根据名字查找\n\t2.根据电话查找\n\t3.显示所有\n\t4.回上级目录");
    scanf("%d",&num);
    switch (num)
    {
        case 1:
            {
                printf("请输入名字:");
                scanf("%s",sql_name);
                zSQL= sqlite3_mprintf("select * from telbook where name='%q'", sql_name);
                rc=sqlite3_exec(db,zSQL,callback,0,NULL);
                sqlite3_free(zSQL);
            }
        break;
        case 2:
            {
                printf("请输入电话");
                scanf("%s",sql_telnum);
                zSQL= sqlite3_mprintf("select * from telbook where telnum='%q'", sql_telnum);
                rc=sqlite3_exec(db,zSQL,callback,0,NULL);
                sqlite3_free(zSQL);
            }
        break;
        case 3:rc=sqlite3_exec(db,"select * from telbook",callback,0,NULL);
        break;
        case 4:option(db);
        break;
        default :
                {   printf("请选择要执行的操作\n");
                    option(db);
                }
    }
    printf("%d\n",rc);
    option(db);
}
int insert(sqlite3 *db)
{
    int rc;
    char *sql_name[20],*sql_telnum[11];
    printf("输入姓名和电话以空格分隔:");
    scanf("%s %s",sql_name,sql_telnum);
    char *zSQL;
    zSQL= sqlite3_mprintf("INSERT INTO telbook VALUES('%q','%q')", sql_name,sql_telnum);
    rc=sqlite3_exec(db,zSQL,0,0,NULL);
    sqlite3_free(zSQL);
    printf("%d\n",rc);
    option(db);
    return 0;
}
int replace(sqlite3 *db)
{
    int rc;
    char *sql_name[20],*sql_telnum[11];
    printf("请输入名字和新电话号码:");
    scanf("%s %s",sql_name,sql_telnum);
    char *zSQL;
    zSQL= sqlite3_mprintf("update telbook set telnum='%q' where name='%q'", sql_telnum,sql_name);
    rc=sqlite3_exec(db,zSQL,0,0,NULL);
    sqlite3_free(zSQL);
    printf("%d\n",rc);
    option(db);
    return 0;
}
int del(sqlite3 *db)
{
    int rc;
    char *sql_name[20],*sql_telnum[11];
    printf("请输入要删除的姓名:");
    scanf("%s",sql_name);
    char *zSQL;
    zSQL= sqlite3_mprintf("DELETE FROM telbook where name='%q'", sql_name);
    rc=sqlite3_exec(db,zSQL,0,0,NULL);
    sqlite3_free(zSQL);
    printf("%d\n",rc);
    option(db);
    return 0;
}
int quit(sqlite3 *db)
{   int rc;
    rc=sqlite3_close(db); 
    if (rc)
    {
        printf("成功关闭数据库\n");
    }
    else printf("关闭失败\n");
    system("pause");
    exit(1);
}
static int callback(void *notused,int l,char **v,char **lname)
{
    int i;
    for (i=0;i<l;i++)
    {
        printf("%s\t",v[i]);
    }
    printf("\n");
    return 0;
}